Document Type : Research Paper
Authors
1 Assistant Professor, Department of animal science, University of Zanjan, Zanjan, Iran
2 Ph.D student of poultry nutrition, Department of Animal Science, University of Zanjan, Zanjan, Iran
3 Assistant Professor, Animal Science Research Institute, Karaj, Iran
Abstract
In order to determine the appropriate standardized ileal digestible (SID) lysine requirement in growing
male turkey poults (28-49 day of olds), one hundred sixty birds were used in a completely randomized
design with eight treatments (8 levels of SID lysine: 1.15 (basal diet), 1.225, 1.3, 1.375, 1.45, 1.525, 1.6,
1.675 percent) in 4 replicates of 5 birds. Increasing of SID lysine levels increased body weight gain and
decreased feed conversion ratio. Dietary treatment of 1.6 percent SID lysine had the highest body weight
gain and the lowest FCR compared to the basal diet (P<0.05). By using of broken line-linear ascending,
quadratic polynomial and broken line- quadratic ascending models, SID lysine requirements for weight
gain were 1.47±0.11, 1.57±0.04 and 1.49±0.05 and for FCR were 1.57±0.17, 1.61±0.02 and 1.59±0.08,
respectively. In conclusion, SID lysine requirements for body weight gain ranged between 1.47 to 1.57
and for FCR between 1.57 to 1.61 percent.
Keywords
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